JP2018079715A - Vehicle air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently and stably blow air to a temperature sensor installation part while increasing the volume of a blast into a vehicle cabin in a vehicle air conditioner.SOLUTION: An aspirator 24 is provided at a wall part of a heat duct 34 attached to a heat air vent 32 in an air-conditioning case 14 forming a vehicle air conditioner 10. The aspirator 24 communicates with the heat air vent 32 through a connection pipe 36 provided within the heat duct 34. Further, the air-conditioning case 14 is provided with a second switching damper 48 which opens or closes the heat air vent 32. A hole part 54 and a guide part 56 which communicate with the connection pipe 36 while facing the connection pipe 36 are provided in a center part of the second switching damper 48 in a width direction. For example, in a vent mode where the second switching damper 48 closes the heat air vent 32, air in the air-conditioning case 14 is supplied to the aspirator 24 from the connection pipe 36 through the guide part 56 and the hole part 54.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioner mounted on a vehicle, and more particularly to a vehicle air conditioner having an aspirator for guiding air in a vehicle compartment to a temperature sensor installation unit that detects the temperature in the vehicle compartment.

  2. Description of the Related Art Conventionally, a vehicle air conditioner mounted on a vehicle includes a temperature sensor that detects a temperature in the vehicle interior, and an aspirator is provided to guide air in the vehicle interior to an installation site of the temperature sensor. The aspirator is installed on a side wall along the width direction of the case body, and has a nozzle that sucks air in the vehicle interior as secondary air to the installation site of the temperature sensor, and an air flow path so as to surround the outer periphery of the nozzle. A main body to be formed and a primary air introduction section that takes in a part of the air flowing through the inside of the air conditioning case as primary air into the main body.

  Then, by introducing a part of the air flowing in the case body in the vehicle air conditioner to the primary air introduction part of the aspirator, the air in the vehicle interior is converted into secondary air through the nozzle to the installation site of the temperature sensor by the venturi effect. The air temperature in the passenger compartment is detected by suction.

JP 2014-141185 A

  In recent years, in the vehicle air conditioner as described above, the airflow resistance has been reduced for the purpose of further increasing the amount of air blown into the passenger compartment, and along with the reduction of the airflow resistance, There is a problem that the pressure drops and the aspirator cannot suck the air in the vehicle interior at a sufficient flow rate.

  The present invention has been made in consideration of the above-described problems, and provides a vehicle air conditioner capable of sufficiently and stably blowing air to a temperature sensor installation portion while increasing the amount of air blown into a vehicle interior. The purpose is to do.

To achieve the above object, the present invention provides an air conditioning case having a flow path for air and a blower opening, and an aspirator that is provided in the air conditioning case and takes in the air in the passenger compartment and supplies the air to the temperature sensor installation unit. In a vehicle air conditioner having
An air duct that is connected to the air outlet and blows air to the vicinity of the passenger in the passenger compartment, and a damper that is provided in the air conditioning case and opens and closes the air outlet;
An aspirator is provided in the air duct, and the air duct and the damper are provided with a communication path that bypasses the air duct and communicates the aspirator and the flow path when the air outlet is closed by the damper.

  According to the present invention, in the air conditioning case constituting the vehicle air conditioner, the air duct that sends air to the vicinity of the passenger in the vehicle interior is connected to the air outlet, and the air duct is provided with the aspirator and opens and closes the air outlet. The damper and the air duct are provided with a communication path that bypasses the air duct and communicates the aspirator and the flow path when the air outlet is closed. This makes it possible to supply the air in the air conditioning case from the flow path to the aspirator through the communication path in the air blowing mode in which the damper closes the air blowing port, while the damper is opened even in the air blowing mode in which the damper is open. Air from the air conditioning case can be supplied to the aspirator through the air blowing port.

  As a result, a part of the air in the air conditioning case can be stably supplied to the aspirator regardless of the air blowing mode in the vehicle air conditioner. For example, a low pressure loss is made to reduce the airflow resistance in the air conditioning case. Even when the internal pressure is low, the air in the vehicle interior (inside air) can be stably blown to the temperature sensor installation section at a sufficient flow rate to detect the temperature in the vehicle interior.

  According to the present invention, the following effects can be obtained.

  That is, in the air conditioning case constituting the vehicle air conditioner, the blower duct that blows air to the vicinity of the occupant in the vehicle interior is connected to the blower opening, and the damper and the blower duct that opens and closes the blower opening are provided with an aspirator in the blower duct. By providing a communication passage that bypasses the air duct and communicates the aspirator and the flow path when the air outlet is closed, air in the air conditioning case is supplied to the aspirator through the communication passage regardless of whether the air blower is opened or closed by the damper. It becomes possible. As a result, in various air blowing modes in the vehicle air conditioner, a part of the air in the air conditioning case can be stably supplied to the aspirator. For example, the internal pressure can be reduced by reducing the pressure to reduce the airflow resistance in the air conditioning case. Even when the air temperature is low, air (inside air) in the vehicle compartment can be stably blown to the temperature sensor installation portion at a sufficient flow rate.

1A is an overall cross-sectional view of a vehicle air conditioner according to an embodiment of the present invention, and FIG. 1B is a front view of a second switching damper in the vehicle air conditioner of FIG. 1A.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail below with reference to the accompanying drawings. 1A, reference numeral 10 indicates a vehicle air conditioner according to an embodiment of the present invention.

  As shown in FIG. 1A, the vehicle air conditioner 10 includes an air conditioning case 14 constituting each air passage (flow path) 12, a blower 16 disposed inside the air conditioning case 14, and the air An evaporator 18 that cools the air, a heater core 20 that heats the air, a damper mechanism 22 that switches the flow of air flowing through the passages 12, and an air conditioning case 14 that is provided in the air conditioning case 14 and sucks air in the vehicle interior. An aspirator 24. In addition, the side part of the air-conditioning case 14 is connected to an inside / outside air switching unit (not shown) for taking in outside air / inside air.

  The air-conditioning case 14 is composed of, for example, substantially symmetrical divided cases 26a and 26b, and a vent air outlet 28 for blowing air near the occupant's face and a defroster air for blowing air near the front window of the vehicle. The opening 30 is adjacent to the mouth 30. In addition, a heat blower port (blower port) 32 that blows air to the vicinity of the feet of the passengers in the passenger compartment is opened in the wall portion 14a on the vehicle rear side (in the direction of arrow A) in the air conditioning case 14.

  A heat duct (blower duct) 34 for blowing warm air to the vicinity of the passenger's feet is attached to the heat blowing port 32 outside the air conditioning case 14. The heat duct 34 is provided, for example, so as to cover the heat blowing port 32 with a substantially rectangular cross section, and the aspirator 24 is provided on a wall portion on the vehicle rear side (arrow A direction).

  In addition, a cylindrical connection pipe 36 that connects the aspirator 24 and the heat blowing port 32 is provided inside the heat duct 34, and the connection pipe 36 extends along the front-rear direction of the vehicle (directions of arrows A and B). It is substantially horizontal, and one end thereof is provided so as to be in contact with a second switching damper 48 to be described later, and the other end extends to the wall of the heat duct 34 to which the aspirator 24 is attached.

  On the other hand, the air blower 16 is housed in the air conditioning case 14 at a position on the vehicle front side (arrow B direction) when the vehicle air conditioner 10 is mounted on the vehicle, and the evaporator 18 is housed below the blower 16. At the same time, the heater core 20 is housed at a position on the rear side of the vehicle (in the direction of arrow A) with respect to the evaporator 18.

  The blower 16 is, for example, a centrifugal fan having a rotary fan 38 having a plurality of fins and a drive motor 40 that rotationally drives the rotary fan 38.

  Then, when the drive motor 40 is driven to rotate based on a control signal from a controller (not shown), the rotary fan 38 rotates and air taken in from the inside / outside air switching unit (not shown) is introduced to the air conditioning case 14 side. And sent to the passage 12.

  In the evaporator 18, for example, a refrigerant is circulated through a plurality of tubes (not shown). When the air passes, heat exchange is performed with the refrigerant, and the cooled air is supplied to the downstream side of the evaporator 18.

  The heater core 20 is provided, for example, on the downstream side of the evaporator 18 in the air conditioning case 14, and warm water is circulated through a plurality of tubes (not shown). When the air passes, heat exchange with the warm water is performed, and the heated air Is supplied to the downstream side of the heater core 20.

  The damper mechanism 22 is, for example, a first air mix damper 42 that is rotatably provided between the evaporator 18 and the heater core 20, and a first that is rotatably provided on the heater core 20 on the downstream side of the evaporator 18. 2 It has the 1st switching damper 46 which switches the ventilation state of the vent blower opening 28 and the defroster ventilation opening 30, and the 2nd switching damper (damper) 48 which adjusts the ventilation state to the heat ventilation opening 32. .

  In the second switching damper 48, the shaft portion 50 is pivotally supported above the heat blowing port 32, and the door portion 52 is opened and closed with the shaft portion 50 as a fulcrum, thereby switching the open / closed state of the heat blowing port 32. The shaft portion 50 and the door portion 52 extend along the width direction of the air conditioning case 14 (in the direction of arrow C in FIG. 1B), and a hole portion that penetrates in the thickness direction at the center of the door portion 52 in the width direction. (Communication passage) 54 is formed, and a guide portion (communication passage) 56 is provided on the side surface of the door portion 52 on the air conditioning case 14 side (arrow B direction).

  The hole portion 54 is provided so as to communicate with the connection pipe 36 through the heat blower port 32 in the closed state where the second switching damper 48 closes the heat blower port 32, and is substantially the same as the connection pipe 36. The upper part is formed in a semicircular cross section so as to have the same cross section.

  The guide portion 56 is formed in a cylindrical shape that protrudes from the side surface of the second switching damper 48 toward the vehicle front side (in the direction of arrow B) and extends downward, and is formed so as to cover the hole portion 54. It is open. The guide portion 56 is provided so that the opening faces the heater core 20 in the closed state in which the second switching damper 48 closes the heat blowing port 32. And the air in the air-conditioning case 14 enters the inside of the guide part 56 from the opened lower part, and is guided to the hole part 54 side along the upper part of the guide part 56 formed in a circular arc shape in cross section.

  The aspirator 24 is, for example, provided at the center in the width direction of the wall portion 14 a of the air conditioning case 14, its body 60 is on the outside with respect to the wall portion of the heat duct 34, and its end surface is a connecting pipe provided on the heat duct 34. 36 so as to communicate with 36.

  The body 60 includes, for example, a main body portion 62, an introduction portion 64 that is connected to the main body portion 62 and introduces air (inside air) in the vehicle interior, and is opposite to the introduction portion 64 with respect to the main body portion 62. And a lead-out portion 66 from which the air taken in the main body portion 62 is led out.

  For example, a pipe 68 connected to the temperature sensor S installed in the vehicle interior is connected to the end of the introduction portion 64, and an instrument provided in the front of the vehicle interior is connected to the upstream end thereof, for example. A storage member (temperature sensor installation portion) 70 attached to the attachment panel is connected, and the temperature sensor S is stored in the storage member 70. That is, the aspirator 24 is connected to and communicates with the storage member 70 through the pipe 68.

  The lead-out portion 66 is joined to the other end portion of the main body portion 62, is formed in a cylindrical taper shape protruding toward the direction away from the main body portion 62, and the air sucked into the main body portion 62 is led into the vehicle interior. Discharge.

  The vehicle air conditioner 10 according to the embodiment of the present invention is basically configured as described above. Next, its operation and effects will be described.

  First, the case where the cooling operation for reducing the room temperature in the passenger compartment is performed (vent mode) will be described. When an occupant (not shown) operates the operation lever in the passenger compartment to select the cooling operation, an actuator (not shown) is driven in accordance with the operation of the operation lever, and as shown in FIG. 1A, the first air mix damper 42 Is rotated to be fully closed, and the second air mix damper 44 is fully opened.

  At the same time, the rotating fan 38 of the blower 16 rotates based on a control signal from a controller (not shown) so that the air sucked into the air conditioning case 14 flows downward along the passage 12 and then the evaporator. Heat is exchanged by passing through 18 and cooled to a predetermined temperature.

  The cooled air flows upward without flowing to the heater core 20 side, and then the vicinity of the occupant's face in the passenger compartment through the vent air vent 28 opened under the switching action of the first switching damper 46. It is blown into.

  At this time, the heat blowing port 32 connected to the heat duct 34 is closed by the second switching damper 48, but a part of the air directed to the vent blowing port 28 is guided to the inside from the opening of the guide portion 56. Then, it is supplied to the aspirator 24 by flowing from the hole 54 to the connecting pipe 36. In addition, since the air conditioning case 14 and the aspirator 24 communicate with each other only through the hole 54 of the second switching damper 48, the air from the air conditioning case 14 circulates only in the connection pipe 36. The air does not flow into the heat duct 34 and air (cold air) does not flow in the vicinity of the passenger's feet.

  In other words, in this vent mode, the connecting pipe 36 bypasses the heat duct 34 and allows the aspirator 24 and the passage 12 of the air conditioning case 14 to communicate with each other.

  As a result, air flows through the body 60 of the aspirator 24 to the lead-out portion 66, a negative pressure is generated inside the main body 62 due to the venturi effect, and the air in the introduction portion 64 and the pipe 68 is sucked by the generation of the negative pressure. As a result, the air in the passenger compartment in which the storage member 70 is installed is sucked into the body 60 of the aspirator 24. As a result, when the air in the passenger compartment is sucked from the storage member 70 into the aspirator 24 through the pipe 68, the temperature of the air passing through the temperature sensor S (the passenger compartment temperature) is detected and output to a controller (not shown).

  That is, even in the vent mode in which the heat blowing port 32 is closed by the second switching damper 48, the air in the air conditioning case 14 can be supplied to the aspirator 24 provided in the heat duct 34.

  Next, when performing a heating operation in which warm air is blown to the vicinity of the feet of the passenger in the passenger compartment (heat mode), the first air mix damper 42 is fully opened in accordance with the operation of an operation lever (not shown), and the second The air mix damper 44 is rotated to be in a fully closed state, and the second switching damper 48 is in an open state in which it is rotated in a direction away from the heat blower port 32 (see the two-dot chain line shape in FIG. 1A).

  Then, the air that has been blown from the blower 16 and cooled by passing through the evaporator 18 is heated to a predetermined temperature by passing through the heater core 20, and enters the vehicle interior from the heat blower opening 32 opened by the second switching damper 48. Supplied with. At this time, a part of the air flowing from the heat blower port 32 toward the heat duct 34 is introduced into the aspirator 24 through the connection pipe 36 provided at the center of the heat blower port 32, so that the air in the vehicle interior is changed. The temperature of the air (vehicle interior temperature) passing through the temperature sensor S is detected by being sucked into the aspirator 24 from the storage member 70.

  Finally, when the bi-level mode is selected in which the cool air is blown to the vicinity of the passenger's face in the passenger compartment and the warm air is simultaneously blown to the vicinity of the passenger's feet, the first is accompanied by the operation of the operation lever (not shown). And the second air mix dampers 42 and 44 each have an intermediate opening between the fully open state and the fully closed state, the first switching damper 46 opens the vent air blowing port 28, and the second switching damper 48 heats. The intermediate opening is slightly separated from the air blowing port 32.

  A part of the air that is blown from the blower 16 and cooled by passing through the evaporator 18 is heated to a predetermined temperature by passing through the heater core 20, and is heated as warm air from the heat blowing port 32 through the heat duct 34. On the other hand, the remaining air (cold air) that does not pass through the heater core 20 flows upward and is blown from the vent air vent 28 to the vicinity of the occupant's face.

  Further, when a part of the warm air flows to the heat blower port 32, a part of the warm air is supplied to the aspirator 24 through the connection pipe 36, and a part of the cool air is heated from the hole 54 by the guide portion 56. 32 is supplied to the aspirator 24 through the connecting pipe 36. As a result, the air supplied to the aspirator 24 is discharged from the main body 62 to the outlet 66, so that the air in the passenger compartment is sucked into the pipe 68 from the storage member 70, and the temperature sensor S is adjusted accordingly. The temperature of the passing air (vehicle compartment temperature) is detected.

  As described above, in the present embodiment, in the air conditioning case 14 constituting the vehicle air conditioner 10, the aspirator 24 is provided on the wall portion of the heat duct 34 attached to the heat blowing port 32, and the heat duct 34 is provided in the heat duct 34. A hole 54 and a guide portion 56 are provided so as to communicate with the heat blowing port 32 through the provided connecting tube 36 and communicate with the second switching damper 48 that opens and closes the heat blowing port 32 so as to face the connecting tube 36. It has.

  Thereby, even in the vent mode in which the second switching damper 48 closes the heat blowing port 32, the air in the air conditioning case 14 can be supplied from the guide portion 56 to the aspirator 24 only through the hole portion 54 and the connection pipe 36. It becomes. On the other hand, even in the heat mode and the bi-level mode in which the second switching damper 48 is opened, the air in the air conditioning case 14 can be supplied to the aspirator 24 through the connection pipe 36 of the opened heat blower port 32.

  As a result, a part of the air in the air conditioning case 14 can be stably supplied to the aspirator 24 regardless of the air blowing mode in the vehicle air conditioner 10. For example, in order to reduce the ventilation resistance in the air conditioning case 14 Even when the pressure is reduced and the internal pressure is low, the air in the vehicle compartment (inside air) is taken into the aspirator 24 side with a sufficient flow rate through the pipe 68 to sufficiently and stably blow the air to the installation site of the temperature sensor S. The temperature in the passenger compartment can be detected.

  In addition, by arranging the aspirator 24 in the center in the width direction of the air conditioning case 14 via the heat duct 34, the air having a relatively high air flow rate and temperature at the center in the width direction in the air conditioning case 14 is taken into the aspirator 24. be able to. Therefore, compared with the vehicle air conditioner according to the related art in which the aspirator 24 is installed on the side wall of the case body along the width direction, it is possible to suppress variations in the temperature of the air taken into the aspirator 24 and the amount of air blown. Thus, it is possible to take in and use air with a stable air flow rate and temperature.

  Furthermore, the flow rate of the air supplied to the aspirator 24 side can be adjusted by changing the shapes of the hole 54 and the guide portion 56 in the second switching damper 48 and the shape of the connection pipe 36 in the heat duct 34, and accordingly Thus, it is possible to adjust the flow velocity of the air in the passenger compartment that is sucked into the temperature sensor S side.

  In addition, the vehicle air conditioner according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Vehicle air conditioner 14 ... Air conditioning case 16 ... Air blower 18 ... Evaporator 20 ... Heater core 22 ... Damper mechanism 24 ... Aspirator 32 ... Heat ventilation opening 34 ... Heat duct 36 ... Connection pipe 48 ... 2nd switching damper 52 ... Door part 54 ... Hole part 56 ... Guide part S ... Temperature sensor

Claims (1)

In an air conditioner for a vehicle having an air conditioning case having a flow path and an air outlet through which air flows, and an aspirator that is provided in the air conditioning case and takes in the air in the passenger compartment and supplies the air to the temperature sensor installation unit,
A blower duct connected to the blower opening for blowing air to the vicinity of an occupant in the passenger compartment, and a damper provided in the air conditioning case for opening and closing the blower opening;
The aspirator is provided in the air duct, and the air duct and the damper are provided with a communication path that bypasses the air duct and communicates the aspirator and the flow path when the air outlet is closed by the damper. An air conditioner for a vehicle.

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